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Relay Protection Test Project Index
This index guides test personnel to identify which modules of the "Protection Star" series software can be used to complete various relay protection device tests.
Note: "(PC)" in the tables refers to software operations in Windows systems, applicable to both standalone relay protection testers and PC-connected systems.
■ Conventional Relay Testing:
| Relay Type | Recommended Test Module | Remarks |
|---|---|---|
| Signal Relay | DC Test AC/DC Test |
For interposing relays requiring both AC and DC inputs, use the "AC/DC Test" module For signal relays with very low rated current, use the voltage circuit output of the tester |
| Time Relay | AC Test | The sequence component module in "AC Test" can test sequence component relays The "I-t Characteristic" module (PC software) can test inverse-time relays |
| Interposing Relay | ||
| Reclosing Relay | ||
| Other DC Voltage/Current Relays | ||
| Current Relay | ||
| Over/Under Voltage Relay | ||
| Sequence Component Relay | AC Test | |
| Synchronism Check (Phase Comparison) Relay | AC Test | |
| Inverse-Time Current Relay | ||
| Differential Relay(DC bias characteristic) | Differential Test, Differential Harmonic (Standalone), Differential Relay, Differential Harmonic, AC/DC Test, Harmonic Test (PC) | Please refer to the manual for correct wiring during testing |
| Differential Relay(DC bias characteristic/Percentage restraint characteristic) | Differential Test, Differential Harmonic (Standalone), Differential Relay, Differential Harmonic, Harmonic Test (PC) | |
| Differential Test, AC Test (Standalone), Differential Relay, AC Test (PC) | ||
| Power (Directional) Relay | Power Impedance, AC Test (Standalone) Power Direction & Impedance, AC Test (PC) |
Before testing power (directional) relays, determine the wiring type and approximate operating boundary of the protection |
| Impedance Relay | Power Impedance, AC Test (Standalone) Power Direction & Impedance, AC Test (PC) |
|
| Synchronizing Relay | Synchronism & Underfrequency Test (Standalone) Synchronism Test, AC Test (PC) |
In the "Synchronism Test" module, single-phase voltage is fixedly output from UA and UC as system-side and paralleling-side voltages respectively |
| Frequency Relay | Synchronism & Underfrequency Test (Standalone) Frequency & Over/Under Frequency (PC) |
When selecting "Auto Frequency Sweep" in standalone tests, frequency rate-of-change settings can be tested |
■ Microprocessor-Based Protection Testing:
| Protection Type | Test Item | Recommended Test Module | Remarks | |
|---|---|---|---|---|
| Line Protection | Multi-stage overcurrent | AC Test | With proper methodology, most relay and microprocessor-based protection tests can be performed using the "AC Test" module - focus on mastering this module | |
| Over/Under voltage | ||||
| Sequence component voltage/current | ||||
| Frequency device | ||||
| Power directional protection | ||||
| Breaker failure initiation | ||||
| Reclosing, reclosing acceleration and transient faults | Complete System Test, Line Protection, State Sequence, 6-35kV Line Protection Comprehensive Test | To test synchronism check and dead line detection, use Ux as the paralleling-side voltage output; for 6-phase voltage testers, use Ua instead of Ux for testing | ||
| Distance and zero-sequence | Distance and zero-sequence setting verification | Distance & Zero-sequence, Line Protection, Complete System Test, AC Test, State Sequence | Both "Distance & Zero-sequence" and "Line Protection" modules can automatically test multiple sections, various fault types and phases of distance and zero-sequence settings | |
| Impedance characteristic | Impedance characteristic test | |||
| Power frequency variation distance element setting test | Distance & Zero-sequence, Line Protection | The fault current should be sufficiently large, e.g. 10~15A (for 5A CTs) | ||
| Composite voltage blocked (directional) overcurrent | Overcurrent, undervoltage, negative sequence voltage, sensitive angle etc. | AC Test, 6-35kV Line Protection Comprehensive Test | Some protections have "undervoltage" and "negative sequence voltage" inputs through different terminals - wiring change may be needed during testing | |
| Line oscillation blocking | Corresponding test items | Power Swing | Note the settings of oscillation cycle and impedance | |
| Underfrequency, undervoltage load shedding device | Corresponding test items | Frequency & Over/Under Frequency, 6-35kV Line Protection Comprehensive Test | If all other conditions are met but the device doesn't operate, confirm whether the device requires simultaneous current input and contact signals | |
| Generator-Transformer Protection | Generator and transformer differential protection | Percentage restraint characteristic | Differential Protection Test, AC Test Differential Protection, Differential Settings, AC Test |
For generator differential protection, when testing with "Differential Protection", treat it as Y/Y transformer protection with both high and low side balance coefficients as 1 "Differential Protection" focuses on curve characteristic searching while "Differential Settings" module focuses on differential setting testing - combining both provides comprehensive differential protection testing |
| Harmonic restraint characteristic | Differential Test, Differential Harmonic Differential Protection, Differential Settings, Harmonic Test |
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| Differential Protection, Differential Settings, Harmonic Test | ||||
| Loss-of-excitation protection | Corresponding test items | AC Test | With proper methodology, most relay and microprocessor-based protection tests can be performed using the "AC Test" module - focus on mastering this module. Note the phase angle between output voltage and current during testing. | |
| Excitation protection | Corresponding test items | AC Test | ||
| Transformer composite voltage overcurrent protection | Corresponding test items | AC Test | ||
| Transformer undervoltage overcurrent protection | Corresponding test items | AC Test | ||
| Transformer overcurrent protection | Corresponding test items | AC Test | ||
| Transformer cooling fan startup protection | Corresponding test items | AC Test | ||
| Transformer overload protection | Corresponding test items | AC Test | ||
| Generator stator ground protection | Corresponding test items | AC Test | ||
| Generator stator overload | Corresponding test items | AC Test | ||
| Generator voltage/frequency protection | Corresponding test items | AC Test | ||
| Generator reverse power protection | Corresponding test items | AC Test | ||
| Generator composite voltage overcurrent protection | Corresponding test items | AC Test | ||
| Generator interturn protection | Corresponding test items | AC Test | ||
| Composite voltage blocked (directional) overcurrent (backup) | Corresponding test items | AC Test | ||
| Composite voltage blocked (directional) overcurrent (backup) | Corresponding test items | See "Line Protection" section above | See "Line Protection" section above | |
| Auto-synchronizing device | Corresponding test items | Synchronism Test | For automatic adjustment tests, input contacts must be wired as specified in the manual | |
| Automatic transfer scheme (fast bus transfer) | Action logic and switch operation timing | ATS Test, Fast Transfer Test, State Sequence | Proper wiring is critical for successful testing - plan test procedures in advance | |
| Bus differential protection | Corresponding test items | AC Test | See "Nari-relays Protection" notes about BP-2B and RCS-915 in Appendix 6 | |
| Fiber-optic line differential protection | Corresponding test items | Before testing, confirm whether the device forms a "self-loop" - if yes, the protection operating value should be half of its setting value |
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